Are you referring to Scope channel 2 switch/mux ?https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual#scope_input_divider_and_gain_selection. You can add a label or clear all labels with the respective button. For pin details refer to the Analog Discovery pinout. Clicking will turn on the Wavegen. Setting the carrier to less than 10X higher than the modulation frequency will result in distortion of and loss of data from the modulation signal. The concatenated high pulse length range is T_clock * [0 to (2^n) - 1], and the duty cycle can be modulated in the range of [0 to (2^n) - 1], with a resolution of 2^(-n). Click "OK" at the bottom and you'll drop back one window. Analog Discovery Custom LabVIEW Wavefrom Generator.zip, Interactive Electronic Toy of Jack-O-lantern & Horse. To the right of that, you now have sliders for each parameter. Any time from 20 ns to 24 hr can be selected, or you can choose "continuous" to not have the signal ever reset. Wavegen channel 1 plays on the right audio channel, and Wavegen channel 2 plays through the left. Thanks for the figure and the typons ! If the power value is greater than 0, the sine function outputs sin(x)(100 / (100 - power)). "Symmetry" changes different signals in different ways, but can have some interesting effects. PDM modulates both the frequency and the duty cycle of a pulse. FFT window for PDM Generator (Patterns 2) in WaveForms Workspace 1. However you choose to open the custom waveform editor window, you have the same options from there across the top of the window. Also, please check out the Digilent blog where I contribute from time to time. usually the heat is proportional to the resistance, (V*I), without high voltage I should theoretically be able to get more current without more heat. In regards to you heat/power question: The PTC is in the feedback loop and when shorting the output to GND the output amp will push it above +/-5V, so more than 5V will drop on the PTC, the worst is when connected to +/-5V, the drop will be above 10V. Higher definition audio will have a higher default playback frequency. For the Analog Discovery: 1) be sure that all 16 channels are configured Bit I/O (menus on the left). Spectrum Analyzer window for PWM (Patterns 1) in WaveForms Workspace 1. This menu is where there are some major differences, so let's look at those one at a time. You can set this to any value between 1 and 30,000 cycles, or choose infinite. Two-channel differential input oscilloscope (25V, 30MHz bandwidth) 16-bit logic analyzer Voltmeter (AC, DC, 25V) Two-channel arbitrary function generator (5V) I connected an external power supply to Analog D and this device can now be connected to Waveform (?!). To get things running open the LabVIEW project. Analog Discovery 2 pinout diagram. WaveForms seamlessly connects to our USB portable oscilloscope, logic analyzer, and function generator products, such as the Analog Discovery Pro family, Analog Discovery 2, Analog Discovery Studio, and the Digital Discovery, with full Windows, MacOS, and Linux support (on almost all devices). Once the opening process beings the Device Selection Loop terminates, and the Run Device Functions section is initiated. "Time span" shows how long your file will play, given the number of samples to be played and the sample rate. The comparator outputs a high as long as the counter value is lower than the register value and a low for the remainder of the carrier period. Un-checking the box will keep the output at the set frequency with no sweep. You can control the frequency and amplitude using a 2d box. The second cycle begins its wait period at the same time, waits for 500 s, and then completes at 4.4 ms. Normally the analog discovery is controlled through the free software package Waveforms. Analog Discovery. I have checked the output of the Audio on my scope, everything is ok. "Window" lets you switch between different Waveforms windows that are open, or access the Waveforms Help window. We have the AD2 connected through the impedance analyzer adapter to high power ultrasonic transducers (20-30kHz,piezo stacks). Otherwise, go nuts. A low pass filter takes advantage of this by essentially creating (for some specific moment in time) a voltage that is proportional to the instantaneous duty cycle. This WaveForms software is free to download from Digilent, so you can try out the interface without actually having one of these units available. "Full" lets you adjust the time scale but auto adjusts the voltage scale. For intermediate duty cycle values, the signals differ. In "No synchronization" mode, no synchronization or trigger parameters are available. Connect the Analog Discovery 2 to the computer and to your breadboard like you have done in the previous labs. The REFIO (VREF1V_AWG) for the DAC should be1V.https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual#awg_reference_and_offset, Probably the output amp is damaged. There were 4096 samples that defined one complete cycle of the waveform we designed. You can control the frequency and amplitude using a 2d box. The trigger-wait-run-repeat settings can be independently configured for each channel and open in each channel's specific pane. Once the trigger condition has been met, the signal will enter the idle condition, outputting the offset value for that amount of time. The device won't be damaged but it is never recommended to push anything to the limits. In particular this project will demonstrate how to control the analog discoveries wave form generator. The first option is "Simple" and should be the default when you open the Wavegen tool. PDM in and filtered output at 500kHz clock speed. Next is the frequency of the signal. To be honnest, i have made an huge mix-take with the device, do you think that someone at Digilent will agree to have look at the device ? The "output" trace is the only signal that will be generated by the Wavegen, but the plot shows all signals to help you visualize the behavior of the modulated carrier. By un-checking the box, the Wavegen will automatically output the chosen waveform for the set number of cycles without the need of additional trigger instances. A PWM modulator usually consists of a register, binary counter, and a digital magnitude comparator. i work at university of Aarhus, Denmark in the department of electronics engineering and the AD2's are used a lot in our education. 3. You can remove one at a time or select "Clear" to remove all files. The truth table implements a 6-bit binary accumulator adder, with DIO10 as overflow. 2.. #STM32 FunctGen# This is a basic function generator that uses the DAC on STM32F4 microcontrollers. If you set the carrier amplitude to 1 V, an index value of 20% will increase the output amplitude to 20% more (1.2 V) than the carrier when the AM signal reaches its maximum amplitude. You can simply type in whatever math function you want using Javascript syntax. The Sample table on the right is the list of all 4096 samples that the device can have in its buffer and these will auto-populate once you generate your signal. If you don't like what happens, simple click "Undo". The first parameter is the signal type. If the device is already in use, the front panel controls are configured so the "OK" button is grayed out. Labels will only appear on this plot. The Analog Discovery 2 connected to my LPF. The 6-bit ROM logic block, ROM1. for a 1 kHz signal, enter a 1 ms run time) will regularly reset the signal output and any accumulated error will continuously be reset to 0. lets you set how many times you want the set signal to repeat before returning the output to idle state. This sub VI simply calls a handful of WaveForms API functions that control the Analog discovery. Perquisites: You must have completed step 2 in the previous project. The first set of controls is for the carrier wave and they match the controls from the "Simple" option. but when i measure the points in your description i do get all the right voltages except the"AWG1/2_REF should be 1V" (as i understand as two seperate points that should read the same voltage. On the left side of the "Play" window you'll have some control options, most of which are blacked out until you import a file. Seumeneur, If the predictable current is important for your use-case use at least a limiting resistor. when i get to typing in the measured values for wavegen 1 i get stuck with the -5 V measurment because it shows - 0.714 ish volts and the wizard are not able to proceed. To get the entire project to stop, you must hit the stop buttons on all the windows that popped up. Pulse Modulation Techniques with the Analog Discovery 2. Whatever waveform you decide on, the Sample box will update the values as edits are made. This event case is the one that calls the. This is a protection and it is not recommended to be hold for long duration due to generated heat and unpredictable (temperature/time dependent) 45-65mA current. "Manual" lets you adjust both the time and voltage scales to get the best view of your signal. With "Normalize" un-checked, any value greater than 1 or less than -1 will go off the top/bottom edge of the plot and will be cutoff and ignored. All channels that have a check mark have been opened and can be viewed in their own separate pane. This will open the standard oscilloscope window from LabForms. Using the Analog Discovery 2 and Waveforms, we can generate these types of signals and analyze how a Low Pass Filter (LPF) is used to convert these carrier signals into an approximated sinusoidal signal. On the right side you have the Sample box. Click "Alter with" again, and repeat the process with "sin(2*PI*X*5)/5". The difference consists in the way the high pulses are distributed over time. They are the same as the controls for the "Simple" option, but with the addition of "Sweep to" and "Damp to" controls just to the right. "Symmetry" is an interesting parameter and changes different signals in different ways. The first portion of this section opens the selected device. Once programmed, the AD2 communicates with the WaveForms application via a USB 2.0 connection using FT232H USB bridge. Standard Cartesian plot rules apply, so only one y value per x value. Analog Discovery 2 A reliable Digital Multi-Meter DMM Probes with Grabber Ends A breadboard Some Male Pin Headers If you haven't already installed WaveForms 2015, you can follow the video installation guides. The goal of this project is to teach you how to control the analog discovery with LabVIEW. The process is rather self explanatory and does not need to be explained in detail. Analog Discovery 2 USB Oscilloscope Software The Analog Discovery 2 offers lots of available scope options, and it's easy to zoom in on certain parts of the waveform Copyright Digilent Inc. Generate Standard Periodic Waveforms Using Digilent Analog Discovery Use function generator channels to generate a 1 kHz sinusoidal waveform, and record data at the same time, using an analog input channel. I'm thinking, why the limit is in the current? We have also destroyed the multiplexer on channel 2 on several occasions. So a 1 V amplitude will travel to +1 V, and then to -1 V, giving a peak-to-peak value of 2 V, 1 V in each direction. that this should be two seperate points? The intention was to make an audible tone generator similar to this one. I have managed to spot a short circuit on the output stage of the AWG1 caused by a fried op amp, i changed it and the consumption is now back to a std level (300mA), the board can now be connected to my laptop without power supply. Click here to see a preview of the project. Connect the AD2 device to your PC using the USB cable provided. It is protected for rails up to+/-5V, but itcould survive miss-connectionto higher 10-15V rails too. Unfortunately, we also dont have the resources (tools and technicians) to repair the broken boards. Analog Discovery 2 can be configured to work with a wide range of traditional instruments using free Waveforms 2015 software (Mac, Linux and Windows compatible). For a "Noise" signal, Frequency determines the DAC update rate. If you are using a modulation frequency that varies, like an audio file, set the carrier to at least 10X higher frequency than the highest expected frequency from the file. "File" lets you open a New Wavegen instance, Open or Save a project, or Export the current Wavegen data, either as an image or as a raw data file, formatted in *.csv, *.txt, or *.tdms, which is specific to National Instruments. Once the project window has opened double click the "GUI Main.vi". Could you proved more info about the experiment? As always, thanks for reading. is also available from the "Basic" signal generator option. The only way to fully disable this idle output and prevent shorting is either keep the offset or initial values at 0 V or un-check the "Enable" box. Checking will open a small window with a number of predefined Javascript math functions. Hi, First, The Analog Discovery 2 is a very handy device and i am very pleased with all the functionality it offers. Here you have fig.19.https://reference.digilentinc.com/_detail/analog_discovery_2/ad2_19.png?id=reference%3Ainstrumentation%3Aanalog-discovery-2%3Areference-manual. *You may also use the original Analog Discovery or the Electronics Explorer Board with Waveforms 2015. The only place it won't show up is if you try to generate a new custom waveform and try to select it from the "type" drop down menu within the custom editor window. It will work with your Mac, Windows or Linux-based machine. Once you click "OK", you'll import the new signal into the previous "Alter" instance, and from there you can alter the current signal again. The carry out (overflow of the n-bit accumulator) is the output, modulated signal. For the first measurements, we use the Digital IO of the M2k or the Digital Static I/O feature of Analog Discovery. Spectrum Analyzer for PDM Generator (Patterns 2) in WaveForms Workspace 1. There are many types of signal modulation (both analog and digital), but we will be looking into two popular techniques in DAC called Pulse Width Modulation (PWM) and Pulse Density Modulation (PDM). For example, if you have "manual" selected, enter "5" in the repeat box, and check "repeat trigger", you will have to click the manual trigger button at the bottom five times. The GUI main window does not have a stop button, and will automatically stop once you have properly closed the other windows. Notice how the frequency of the PWM signal is constant, but the duty cycle changes every period. What can you say about the conversion resolution? Verify the AWG1V2_REF, which should be 1.2V, andthe AWG1/2_REF should be 1V The samples are used as the register described earlier in this section. Note that by default the carrier is a full order of magnitude higher than either the FM or AM frequencies. Once you open the custom editor window, no matter which tab you have selected, you can simply click on the plot in the middle of the window and start drawing. For a fun application of how to use both frequency and amplitude modulation in a circuit, check out this I'ble. If you decrease the base time interval, you can get a look at the PWM signal. Notice, again, how the frequency is constant. DAD Board Tutorial By David Munzer Table of Contents Downloading the software pg 4 Using An overview of all the functions available in the API can be found in the WaveForms Reference Manual. will normalize the plot values between -100% and +100% for the y-axis, and 0% and +100% for the x-axis. The preview plot is on the right side of the Wavegen window and will show the expected waveform output for the current Wavegen option chosen. You most often see signal modulation in radio frequency applications, but you can modulate any signal with any frequency down to but excluding DC signals. allows you to export the current custom waveform to a file. As a result the device disconnected from my laptop. Fnirsi-1014d 7" LCD 2 Channel Signal Generator Digital Storage Oscilloscope N2n4. The whole thing will take 5 ms to happen. I'll try and clarify with a full example after explaining the options. You can choose either the initial value or the offset. I encourage you to play around with this setting with each of the different signals to really get a good idea of what it does. often the i try to do the calibration wizard to get a hint of what's wrong. You can hard set the range of each slider, with the slider itself determining the actual value. Any time from 20 ns to 24 hr is valid, or you can select "none" to not wait at all. A refresh button option has been added so you can connect a device after starting the GUI Main.vi. Did you make this project? Alternatively, changing the sample rate will adjust the frequency to match. Adjusting "Frequency" will automatically adjust "Span", which is the total playback time in seconds. The waveform generator now performs at bandwidths of 9 MHz (flywires) and 12 MHz (BNC adapter). I know can be a silly question, but I prefer to be sure about this. The LPF we will be using is a 10k ohm resistor in series with a 10nF capacitor to ground. For more on how signal modulation works, check out the Wikipedia articles here for Amplitude Modulation and here for Frequency Modulation. You can also trigger the signal manually by setting the trigger to "manual" and then clicking on in the bottom left corner of the window. DC offsets can potentially damage speakers/headphones. I'm thinking that the piezos might generate voltage spikes? For applications that are better suited to breadboards, the Breadboard Breakout and Breadboard Adapter provide different options for quick connection to a breadboard. It's equipped with 13 instruments including an Oscilloscope, Logic Analyzer, Spectrum Analyzer, Waveform Generator, and more. Adjust "First" or "Count" and "Time span" will automatically adjust to match. Share it with us! Hi @attilasomeone knows how to use safe the AWG? Start in the "Math" tab, make sure "Normalize" is checked, and generate a sine waveform using the function "sin(2*PI*X)". It has the same duty cycle as the corresponding PWM signal, but instead of 4 * T_clock adjacent high and low values, it alternates for each T_clock. Nothing bad append to the actual `` last '' custom option is really good building Clicking the top of the default playback frequency or you can select `` Clear '' to 60 % i. 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